JP6458211B1 - Soft badminton racket set for soft badminton - Google Patents

Abstract

[PROBLEMS] To provide an environment similar to that of adult athletes that opens up the path for racket competition for young children, and is provided with a total of 8 stages for adults, including a 7-stage age stage according to the development stage of young children. A set of 8 soft badminton rackets that are stepped in size. SOLUTION: 8 size 11LW / 12U for 2 years old, 10LW / 11U for 3 years old, 9LW / 10U for 4-5 years old, 8LW / 9U for 6-7 years old 7LW / 8U for 8 to 9 years old, 6LW / 7U for 10 to 11 years old, 12 to 17 years old, 5LW / 6U for adult women and 5LW / 5U for adult men With the components in [Selection] Figure 17

Description

  The present invention relates to a soft badminton racket. Moreover, it can be used for badminton shuttles and badminton squash shuttles.

At present, racket sports competition tennis and badminton are widely used such as squash. The badminton racket is used because the sports competition soft badminton newly invented in 2016 does not have a dedicated racket. Such badminton rackets generally have a flat octagonal straight rod grip connected to one end of the shaft, a medium isometric head connected to the other end of the shaft, and a grommet in a hole through which many strings pass through the head frame. Fit. In the frame, a plurality of strings along the vertical direction are arranged at intervals in the horizontal direction, and a plurality of strings along the horizontal direction are arranged at intervals in the vertical direction, so that the mesh is evenly crossed. The hitting surface is formed. For example, it is disclosed in Patent Documents 2, 3 and 4 and Non-Patent Document 1 of prior art documents.

JP 2017-38754 A Noto 3047519 JP 2001-70481 A JP 2004-215852 A Special table 2006-510395 published

Toyama's first !! Badminton brand "FORZA-Forza-"

  The sports competition described in Prior Literature 1 «Soft Badminton Soft Shuttle» has used a badminton racket since there was no dedicated racket since its development. Soft badminton is a racket competition, such as using a sponge ball with a diameter of 40 to 70 mm, and a soft badminton shuttle with multiple ribbon blades attached to such a sponge ball. There is a need for a soft badminton racket that accommodates the characteristics of sponge spheres being light and large.

Speaking of badminton rackets, the evolution of materials and innovations in manufacturing technology are evolving rapidly as research continues for decades. For adult badminton enthusiasts, high rigidity, high resilience, durability, excellent strength, light weight, excellent operability and agile rackets are said to be provided. Most current rackets are 2-5U, 75-94g Due to the weight of the front and rear, further weight reduction is required for adults, and recently a 6U racket has been developed by strengthening the material and devising weight reduction. The total length and width of the racket are unified according to the badminton rules. In other words, the best materials and state-of-the-art manufacturing techniques are all made for badminton rackets for adult athletes. However, until now, it has not been possible to support an appropriate racket for elementary school badminton players.

Currently, badminton racket toys are often seen to make children interested in sports, but it is almost like an image of a table tennis racket. The badminton image is too heavy, the racket shaft is short, and the anti-elasticity that is too hard can be used. For young people with a head that is too big, it feels like an adult hitting a badminton shuttle with a tennis racket. An appropriate sized set racket is required depending on the child's developmental stage, in order to bring out the interest of badminton to the infant to guide the adult athlete.

In addition, if the shaft of the badminton racket is too strong in bending rigidity, there is a problem that it is difficult to exert on one side, and it suppresses vibration and resonance at the time of striking and does not attenuate, so that the impact force when hitting the shuttle is handed to the hand Furthermore, if the resonance at the time of striking continues to vibrate for a long time, not only will the player's hand be vibrated, but there is also a risk of causing problems such as tennis elbows due to long-term use.
In addition, it is a common knowledge that the problem that the resilience cannot be exhibited unless it has a certain performance, and countless experts and contractors have been researched to solve this problem. For example, it is disclosed in prior patent documents 2 and 3, and the first Gabon shaft racket ROOTS GAVUN AERMET 600 (Roots Gabon Amet 600) appeared about the invention of document 2 around 1997.
The Gabon Shaft Racket I bought around 2001 (GOSEN GAVUN TITAN 3500) 3U5 is now taking care of it again. I liked the racket design beautifully. There is a problem that the racket neck part has a thin part with an outer diameter of 10 mm length, but it does not change hard bending due to the middle part of the shaft, and the bending elasticity cannot be exhibited.

In addition, with respect to the prior art document 3, when a reinforcing ring is attached to the racket neck, by inserting a reinforcing fitting tube having a length of 100 mm in the rear part of the shaft lumen, the inflection point can be moved forward by increasing the rigidity of the rear part of the shaft. Although the elastic force may increase a little, it seems that the bending rigidity can be increased by reducing the inflection range, that is, the anti-elasticity is due to the anti-elasticity of the bending inflection recovery. I think that the causal relationship is that when the force is applied to the shaft, the bending change of the shaft is large, but the anti-elasticity is also large. Since Document 3 does not increase the numerical value of the bending change of the shaft, the elastic force cannot be increased greatly, and there is a problem of an increase in weight.

In addition, the number of badminton racquet grommets (parts through which strings are passed) is generally 76, 22 vertical strings of mesh hitting surfaces, and 23 horizontal strings. On the other hand, Toyama Prefecture's first non-patent document 1 !! The badminton racket FORZA has 96 grommets, which are 20 in number, 24 striking surface vertical strings, and 27 to 28 in width. There is a problem that the weight cannot be reduced by reinforcing with the thickness of the head mume because it is a strong product that is easily damaged due to many holes.
In addition, the weight increases due to the use of many grommets, and the portion of the head frame that protrudes from the head frame increases the volume of the head frame, so the air resistance at the time of hitting is subtle. Also, because the string hitting cloth is used for the hitting surface, the hitting surface becomes hard like a plate. The shuttle speed falls. There is a problem that the weight increases slightly, the resistance to the air blows off when swinging is somewhat large, and the shoulders and elbows are strained on the wrist when playing for a long time.

Badminton racket grips are mainly wooden, but synthetic resin cylindrical grips have also been developed. Although they are made of different materials, the shapes are the same, and the middle gripping part is an octagonal straight bar with a tapered grip tip. It has a three-part configuration with a grip end at the bottom end. (The shape of the racket grip is disclosed in the prior patent document 4.) The racket has been evolving for a hundred years, but the shape of the grip is unchanged and used as it is.
However, the octagonal straight rod-like grip that is close to an ellipse has an obscure bulging angle, so it is difficult to perform fine agility to change the flight by switching the racquet surface to the left and right with the fingertip twist of the hand. is there.
Grip grip methods are broadly divided into three categories: Eastern grips, Western grips, and thumb-ups. There are advantages and disadvantages to gripping each, so changing the grip method during a fierce game, Up to now, it is extremely difficult because of the obscure elevation angle of the octagonal straight rod-like grip close to an ellipse.
In addition, the role of the end part of the grip of the badminton racket so far serves to prevent the racket from sliding down from the hand, but it is extremely difficult to hit the ball depending on the shape, almost one point for the racket operation, changing the flight When trying to do so, it is necessary to create an oblique face surface by the pronation or supination motion of the wrist and elbow, and the ball striking force cannot be sufficiently exerted, and there is a risk of causing pain in the wrist, elbow, etc. due to long-term use.
In addition, as for the grip of the tennis racket of Prior Literature 5, when the literature is presented and the grip cross-sectional view of FIG. 3 is seen, it is an octagonal shape made from a square and can be practically used for tennis. An octagonal grip is required.
In addition, a flat sphere whose end shape is crushed up and down, and a shape similar to the end of a baseball bat, helps to prevent the racquet from slipping naturally from the hand. There is a problem that cannot be done.

In addition, with regard to junior rackets, the following contents are described with reference to two examples of junior badminton rackets that have recently been mail-ordered.
1) Yonex Badminton Racket MP2JRG
A racket for juniors for 3 to 5 years old (height 90 cm to 110 cm) and leisure.
* Material / Aluminum frame, Steel shaft, Aluminum T-type joint
* Size / 4U (average 83g) 7 * Color / Red (001) * Recommended tension / 14-18 (pound)
2) Ignio (IGNIO) [Uplift] Junior leisure badminton racket (IG LITE-54) * Material: Aluminum frame, steel shaft * Frame weight: 90 ± 10g * Length: 540mm * Recommended tension: 16-18 pounds * Play Style: Leisure Junior * 2016 model The total weight of the above two junior rackets is 83g and 90g, the same weight as the adult racket, the head size is the size of adult goods, two examples The eyes were just short shafts, the other parts were unchanged. If it is used by a young child aged 3 to 5 years old, wrists and elbows are strained on the shoulders, and there is a possibility of causing injury and sports problems at an early stage.

There are various problems mentioned above, but there are many wonderful things that have been dealt with by young children in modern social life. For example, the bicycle industry is provided with a set of bicycles of the right size according to the development stage of children, and young children ride the sizes attached to the bicycle in order according to the law of natural growth, << height 83 cm ~ 98cm (12 inches) guide age 2 to 3 years, height 92cm to 107cm (14 inches) guide age 3 to 5 years, height 98cm to 119cm (16 inches) guide age 3 to 6 years, height 103cm to 125cm ( 18 inches) Estimated age 4 to 8 years old, Height 111 cm to 140 cm (20 inches) Estimated age 5 to 9 years, Height 116 cm to 145 cm (22 inches) Estimated age 6 to 11 years, Height 122 cm to 151 cm (24 inches) ) Estimated age 7 years old or older >> It is common sense to go to adults. It is correct that you can change bicycles by size while growing in age and height from childhood.

In view of the above various circumstances and the actual situation of the badminton environment of young children, the present invention provides a good environment for soft badminton to the young children or draws out the interest of racket competition to the infants, The purpose is to provide a soft badminton racket suitable for striking soft badminton shuttles and to provide a set of 8 rackets that can be used according to age and height for young children in developmental stages. Is.

≪About the racket size symbol, for example, 11LW / 12U is explained as an example, L is the total length of 325mm, W is the width of 135mm (head width), U is the symbol of the total weight of the badminton racket, and the size is incremented by 5g It is. 12U is 40-44g. ≫
The present invention is a soft badminton racket set for soft badminton according to the present invention in order to achieve the object in the above circumstances.
In the development stage of young children, the racket used can be molded from reinforced plastic or polypropylene (PP) material, so that you can start playing racket activities because you are interested in playing while you are 2-5 years old. The competition racket used from 6 years old to adult athletes is made using carbon material,
As the size of the racket changes with the growth of young children, eight rackets are provided, and the approximate size corresponding to the age is
11LW / 12U total length 325mm for 2 years old , width 135mm, weight 40-44g · 10LW / 11U total length 400mm for 3 years old , width 145mm, weight 45-49g · 9LW / 10U total length 475mm for 4-5 years old , width 160mm, weight 50 -54g · 6-7 years old 8LW / 9U total length 525mm, width 175mm, weight 55-59g · 8-9 years old 7LW / 8U total length 575mm , width 185mm, weight 60-64g · 10-11 years old 6LW / 7U total length 625mm, width 195mm, weight 65-69g · 12-17 years old is the same as adult women 5LW / 6U total length 675mm , width 210mm, weight 70-74g · adult men 5LW / 5U total length 675mm , width 210mm, weight 75 ~ 79g size and 8 size,
A soft badminton racket set is provided.

Moreover, in the above-mentioned invention, a soft badminton racket made of PP material,
When an elliptical head frame portion having a string made of PP material is molded into a cross-sectional H shape,
A shaft portion with a thin tip and a thick tail end joined to the head frame portion is formed into a cross-sectional H shape,
A hollow shape is provided to lighten the octagonal cylindrical grip part joined to the shaft part.
Further, the provided when provided with a foam rubber grip cover portion having a gentle shock performance, and
A soft badminton racket structure made of PP material characterized by

Moreover, in the above-mentioned invention, a soft badminton racket for competition made of carbon material,
The racket has 8LW / 9U, 7LW, 8LW / 9U, 7LW / 8U, 6LW / 7U, 5LW / 6U, 5LW / 5U, and 5L racket. / 8U · 6LW / 7U 3 size racket is shortened step by step, and there is a measure to reduce by step provided in the head frame,
The internal space of all five sizes of the head frame is provided with the same inner diameter,
In order to reduce the weight of the head frame of the 5 size racket, the thickness is provided from 5LW / 6U one step at a time.
The outer diameter of the five-size racket formed from a large size to a small size depending on the inner diameter and thickness of the rack, and a frame that is formed step by step;
In the 5 size racket head, the 5LW / 5U and 5LW / 6U size rackets are provided with a tendency to reduce the grommets compared to the badminton rackets used in the conventional 76 grommets, and the head frame size of 6LW / 7LW / 8LW size By the stage, the grommet is provided step by step reduced by one stage,
Due to the decrease in the grommet, the number of vertical and horizontal strings is reduced by size step according to the number of grommets.
The square mesh formed by crossing the vertical and horizontal strings due to the reduction of the string is formed into a knitted mesh-like striking surface that gradually expands from a large size to a small size, and
Forming a hammer part of an adult male racket by placing a weight of 3 to 7 g of soft lead in the hollow interior of the head frame tip of the 5LW / 5U size racket,
It can be a soft badminton racket structure for competition made of carbon material .

Moreover, in the above-mentioned invention, a soft badminton racket for competition made of carbon material,
The five-size racket has an inner diameter of the shaft that supports the annular head, all having the same dimension, and
In order to reduce the weight of the racket to a small size, the thickness of the shaft is reduced from the thickness of 5LW / 5U to one step at a time.
The outer diameter of the shaft is formed to be thinned stepwise by the inner diameter of the shaft and the thickness of the stepped size,
The 6LW, 7LW, and 8LW size shafts are shorter than the length of the shaft.
The tip of the 5 size racket in the axial direction of the shaft (the neck portion of the racket) is deformed into an elliptical shape by a special jig round core rod and an elliptical pressurizer formed with an elliptical portion, A bending elastic neck provided with a minor axis on the double-sided striking surface in a direction, and
It can be a soft badminton racket structure for competition made of carbon material .

A soft badminton racket for competition made of carbon material of the present invention,
By narrowing the four lateral widths of the diagonal face of the deformed octagonal bar in the front half of the grip part that operates the racket, the two lateral flat widths on the ball striking face side and the side face are increased. Because the width of the octahedron is narrowed by cutting to about two thirds,
A large raised shape is formed in the middle of the first half due to the narrow middle part, and
The end portion of the grip has a curved shape like a two-step bulge to form a larger bulge shape in the first half,
A soft badminton racket for competition made of carbon material characterized by the above can be constituted.

  The plastic racket of the present invention is small, light, easy to operate, excellent in bending, and the foam rubber grip cover has a flexible cushion and has cushioning characteristics, etc. It makes a good impression on young children By planting it, young children can play games and draw out the interests of the competition, have dreams, and have a positive effect on early education for gifted children.

  In addition, it can be changed to use according to the size of the racket set at any age of young children at the development stage, the racket is too heavy, the shaft is too hard, the head is too big and the unpleasant feeling Dissemination can be accelerated by eliminating injuries to the wrist, elbows, and shoulders, and enabling fun sports activities.

In addition, the racket is effective not only for soft badminton competition but also for badminton squash competition and badminton competition.

The carbon soft badminton racket head is not only lightened by reducing the grommet, but also has excellent head frame durability. Or, the power of the hit ball can be greatly increased by providing a hammer at the tip of the adult male racket head.

By reducing the string, the hard striking surface changes into a striking striking surface, increasing the repulsive force, reducing the air resistance, shortening the swing time, and increasing the shuttle speed.
When the racket of the present invention is used for badminton, the mesh size of the reticulated ball striking surface is 10 mm square, and the surface of the shuttlecock that is required for the operation of the cut ball game enters the ball striking surface mesh, and the spike performance is increased. Generated and can be greatly changed in width by hatched flight.
As for the most difficult technique of hairpin shot operation, it is more effective by rotating the shuttle that traverses the racket horizontally and lightly and dropping it vertically over the net with a spin net.

The bending due to the racket bending elastic neck is greatly amplified, vibration and resonance at the time of hitting are suppressed and attenuated, and the impact force is cut off and it is difficult to transmit to the player's hand, so the burden on the wrist and elbow can be reduced.
In addition, the bending elastic neck is provided at the forefront of the shaft, so that the bending range of the shaft can be narrowed down to the tip and the operation performance can be further improved. Furthermore, a highly repelled hitting ball becomes possible by greatly increasing the resilience.

Two-step raised curved shape 2-point operation Multi-functionality is provided in the grip part, so that the gripping surface can be twisted freely with the thumb, forefinger, and middle finger, and the ball striking surface can be freely converted for easy agile operation The grip end portion can be operated to grip two points by a large octagonal shape with a flat shape. The distance between the end where the smashing force is applied and the ball hitting surface at the action point is extended, and the hitting power can be further increased.
In particular, the hammer striking force of a 5LW / 5U racket for adult men plus the high impact of the bending elastic neck and the power impact of the power end can realize an explosive striking force.

≪In the present invention, all sets of 8 rackets are made of PP material for 2 years old, 3 years old, 4 to 5 years old, 3 for carbon materials and 6 to 7 years old, for 8 to 9 years old , 10 to 11 years old, 12 to 17 years old and adult women, 5 men for adults, 3 PP made of 11LW / 12U size racket for 2 years because of the same structural style Submit the drawings to the representative. Omit the drawings of rackets for 3 years old and 4-5 years old. Or, for the five carbon material rackets, the 5LW / 5U size racket drawing for adult men is submitted as a representative figure because the structure is the same, and the other four size racket drawings are omitted. ≫
FIG. 1 is a representative view of three types of rackets molded from polypropylene or reinforced plastic (PP) material according to the present invention, an 11LW / 12U drawing, and a front view showing the structure of the racket. It is a side view which shows each part thickness of the state seen from the side of the racket in the racket of FIG. It is a figure which shows each site | part dimension from the H-shaped cross section of the head frame part 21-A in the racket of FIG. It is sectional dimension explanatory drawing of the front-end | tip part and tail end part of the H-shaped shaft in the racket of FIG. It is a front perspective view which shows the grip cylindrical body part and end part disassembly state in the racket of FIG. 5-2 shows the cross-sectional dimension of the cylindrical body. The state which carried out end fitting with the grip cylinder in the racket of FIG. 1 is demonstrated. It is a longitudinal cross-sectional view in the state which fitted the grip cylindrical body part and cylindrical foamed rubber cover part in the racket of FIG. 7-2 is a partial cross-sectional view of the grip straight. 7-3 is a bottom cross-sectional dimension of the grip foam cover end portion. It is a top perspective view in the state where the grip part in the racket of Drawing 1 is completed. <Carbon racket drawings according to the second embodiment> It is a front view which shows the carbon material racket structure which concerns on this invention. FIG. 10 is a side view of the racket in the racket of FIG. 9 and a front view for explaining the configuration of the head portion of FIG. 10-2. FIGS. 10-3 to 10-5 illustrate the configuration of the male adult hammer section. Are provided at the tip of the shaft having the bending elasticity of the racket neck in the racket of FIG. 9, a bending elastic neck view, 11-1 front view, 11-2 a bending elastic neck top view, 11- 3 is a side view, and shows a cross section of an 11-4 bending elastic neck. Is a drawing showing the shape of a special jig “core rod” that needs to evolve the shaft in the racket of FIG. 12-1 in the figure and 12-4 in the figure to show the extension core bar, having 12-1 in the front view and 12-2 in the side view. FIG. 9 is a procedure diagram showing a method for forming a bending elastic neck by a jig core rod of the shaft in the racket of FIG. 9, and 13-1, 13-2, 13-3, and 13-4 are described. FIGS. 14-1 and 14-2 show the process steps of forming an elliptical bending elastic neck by a special jig << ellipse forming pressurizer >> for forming an elliptical bending elastic neck in the racket of FIG. 14-3, 14-4, 14-5. These are 16-1 of the front and 16-2 of the side which show the curved shape of the two-step protrusion of the offense and defense grip part in the racket of FIG. FIG. 9 is a plan perspective view of an offense / defense grip portion having agile operation function and striking power function in the racket of FIG. 9 and two-step raised portion cross-sectional dimensions 17-2 and 17-3. FIG. 10 is a side view of the racket showing a bent state generated by applying an external force to the bending elastic neck portion of the racket in the racket of FIG. 9.

  The soft badminton racket set according to the embodiment of the present invention is implemented in 17 drawings, and the set of 8 rackets is manufactured using two kinds of materials and two kinds of rackets are manufactured. The configuration of the PP material racket according to the first embodiment will be described with reference to FIGS. 1 to 8. The construction of the carbon material competition racket according to the second embodiment will be described with reference to FIGS. Although the PP material racket 10 and the carbon material racket 100 are provided, in the following description of the first embodiment, the racket 10 will be described first, and then the racket 100 will be described in the second embodiment.

<< Outline of configuration of racket 10 according to this embodiment >>
As shown in the front view of FIG. 1, the soft badminton racket 10 has a head portion 20, a shaft portion 30, and a grip portion 40.
The ten soft badminton rackets according to the present embodiment are used for materials such as polypropylene and reinforced plastic (PP), etc., and are racquets that can be molded by various methods such as compression molding and vacuum molding using a mold. 20 is joined to the tip portion of the shaft portion 30 using a connecting triangle T-joint and connected to the grip portion 40 using a shoulder portion at the tail end portion of the shaft.
Also, by attaching the grip cover part made of foam rubber with a large octagonal bulging shape to the end part on the grip, 11LW / 12U for 2 years old, 10LW / 11U for 3 years old, 9LW / 10U for 4-5 years old The soft badminton racket is made up of.

前記２歳から５歳まで４年齢段階に３サイズラケット対応しているですが、もう一本追加して４本にするでも良い。全長が３２０〜４７５ｍｍまでの長さ間に４サイズの長短を調整する。例えば、３２５、３７５、４２５、４７５ｍｍのような４サイズ長さでも良い。 As described in the outline of the structure of the racket 10, the size of the soft badminton racket in 11LW / 12U for 2 years old, 10LW / 11U for 3 years old, and 9LW / 10U for 4-5 years old is as described in the table below.

From the age of 2 to 5 years old, 3 size rackets are supported at the age of 4 years, but another one may be added to make 4 The length of 4 sizes is adjusted between lengths of 320 to 475 mm. For example, four size lengths such as 325, 375, 425, and 475 mm may be used.

<< The PP cylindrical body part of the grip of this embodiment is marked with -B in the number of each part of the grip PP cylindrical body to distinguish it from the finished product part fitted with the foam rubber grip cover. ≫
1 to 8, the racket 10 will be described in detail. In the present embodiment, children 2 to 5 years old are interested in the racket game with a sense of play. Therefore, in the manufacture of the racket, a PP material having a flexible restoring element is selected, and a small racket is used so that the wrist and the elbow are not burdened. Three types of sizes are provided according to the age stage, and because of the same structure, the description of the sizes of 9LW / 10U and 10LW / 11U is omitted (the size list of each part has been submitted), and the size of 11LW / 12U is shown in the drawing Will be described in detail.
As shown in FIG. 1, the 11-year-old 11LW / 12U size has a total length of about 325 mm, and a total weight of 40 to 44 g (appropriate for the total length and may be adjusted negative or positive). The head part 20 has an elliptical shape of L150 mm × W135 mm. The four flange portions 21 on both sides of the double-sided concave groove 22 on both sides, in which the H-shaped concave groove portion 22 that is characteristic of the frame portion 21-A (hitting ball frame) faces the both spherical surfaces of the elliptical head frame portion. The H-shaped web portion 26 is parallel to the ball striking surface. The width (W) of the frame portion 21-A is 6 mm. This H-shaped frame is superior in strength and flexibility due to the round-shaped I-frame. (H-shaped cross-sectional dimensions are shown in FIG. 3)
In the elliptical frame 21-A of the head portion 20, the string is formed together with the five vertical strings 23 and the six horizontal strings 24. The string has a width (W) of about 1 in the direction parallel to the striking surface. A ball striking surface having a thickness of about 0.5 mm, a thickness (T) in the crossing direction of about 3.0 mm, and a square 21 mm mesh formed by cross-forming the vertical and horizontal strings is formed.
There is a list of sizes of each part of the head configuration of 10LW / 11U for 3 years old and 9LW / 10 to 8U for 4-5 years old.

In addition, the joint portion between the head portion 20 and the shaft tip portion 30-E is easily torn, whereas a T-shaped triangular joint portion 25 is provided for increased strength. The horizontal width parallel to the surface is good about 35 mm, and the length about 20 mm is preferable in the vertical axis direction (Joint sizes of 10LW / 11U and 9LW / 10U are listed in Table 3). It is preferable to mold according to the size of the tip 30-E.

ＰＰ素材製シャフト部のサイズ一覧表（３）
シャフト成形されたＨ形状の断面寸法が後述の図４に於いて説明する。 In the shaft portion 30 characterized by the H shape according to the present invention, the tip portion 30 -E is connected to the head portion via the joint portion 25. The tail end portion 30-G is connected to the grip portion 40 via the shoulder portion 41-B. The length of the shaft portion 30 is 65 mm (the shaft portion can be adjusted to be extended or shortened). As shown in the front view of FIG. 1, the tip 30-E has a width (W) of 8 mm, the tail end 30-G has a width (W) of 11 mm, and the shaft has a narrow tip width and a wide tail. A concave groove 32 is formed in the middle of both flange portions 31.

PP material shaft size list (3)
The shaft-shaped H-shaped cross-sectional dimension will be described with reference to FIG.

Further, in order to eliminate the different thickness, the grip portion 40 and the shaft tail end portion 30-G are provided with a shoulder portion 41-B having an octagonal taper shape with a length of about 10 mm. The thickness can be adjusted to 30-G, and the shaft part and the grip part can be smoothly joined.
Further, the foamed rubber grip cover portion 51 is attached to the outside of the cylindrical body portion 40-B joined to the lower side of the grip shoulder portion 41-B, whereby the grip portion 40 is configured. The grip portion 40 is not a homogenous width of the octahedral plane, but is a flat octagonal grip portion 40 in which the diagonal surface portion 43 is narrow and the flat surface portion 42 parallel to the striking surface is wide. The end portion 44 of the foamed rubber cover of the grip is provided with a bulging shape in eight directions.

FIG. 2 illustrates the state of the racket 10 viewed from the side. The racket 10 is confirmed to have a thickness (T) 6 mm of the frame portion 21-A, the frame portion 21-A, the joint portion 25, and the shaft. The shaft tail end portion 30-G, in which the tip portion 30-E is connected with the same thickness, is connected to the via grip portion 40 in the shoulder portion 41-B. The thickness of 30-E is about 6 mm, the thickness of 30-G is about 9 mm, and the tip of the shaft is formed to be thinner than the tail, so that the bending elastic region is moved forward, and the ball striking surface is delayed when the ball is swung. Without swinging, you can reach the hitting point quickly and improve your power. When the outer shape of the foam rubber grip cover portion 51 of the grip portion 40 is viewed, it is confirmed that the end portion 44 bulges from the main body.

In FIG. 3 sectional view of the elliptical H-shaped frame portion 21-A, the dimensions of the H-shaped portions will be described. FIG. 3A is a local view of the front view head part, which is greatly enlarged for easy understanding. The middle of the two flange portions 21 has a concave groove portion 22. In FIG. 3B, W represents the width of the striking surface and the parallel frame portion 21-A, T represents the thickness of the side surface of the frame portion 21-A, and 21-A represents about W6 mm × T6 mm. The concave surface of the H-shaped double-sided concave groove portion 22 is directed to the ball striking surface, the concave groove 22 has a width of about 3 mm and a depth of 2 mm, and both sides have four flange portions 21. 5mm, about 2mm in thickness of the intermediate horizontal web portion 26, and H-shaped grooves provide light weight and strength, or the H-shaped frame has higher strength due to its cylindrical shape or quadrangular shape. The property is excellent. (The W of the flange portion 21 is set to 2 mm because it becomes W 7 mm of the frame 21-A of 10 LW / 11 U. The concave groove portion 22 has a good W of 2 mm because the flange 8 is provided with W 8 mm and T of 9 LW / 10 U. Is amplified up to 4 mm, depth is 2.5 mm.)

In FIG. 4, the shaft section H shape will be described. The H-shaped shaft has a high strength due to the pipe-shaped shaft made of the same material, and is excellent in bending and bending recovery.
According to FIG. 4, the front width parallel to the ball striking surface indicates W, the thickness in the cross direction side surface indicates T, and the thickness of the tip portion 30 -E of the shaft portion 30 (where it is connected to the joint) is W8 mm × T6 mm, It has an H-shaped vertical flange portion 31, a lateral web portion 33, and a concave groove portion 32. The flange portion 31 has W2 mm × 4 on both sides, the concave groove portion 32 has a width of 4 mm, a depth of 2 mm × 2 on both sides, and an H-shaped intermediate web thickness of about 2 mm.
The thickness of the tail end portion 30-G of the shaft (where it is connected to the shoulder) is about W11 mm × T9 mm, and the thickness of the flange portion 31 is 2 mm × 4 on both sides. The concave groove 32 has a width of 7 mm, a depth of 3.5 mm, two on both sides, and an H-shaped web portion 33 having a thickness of about 2 mm. The shaft tip 30-E is thin and the tail end 30-G is thick, so the bending point of the racquet shaft is moved to the vicinity of the head at the tip, and it is easy to operate the racquet by increasing the rigidity at the rear of the shaft. . The soft head neck absorbs the striking power of the ball and reduces the burden on the wrist and elbows of young children.
Each part of the 10LW / 11U racket shaft H shape is 30-E, the flange 31 is W2 mm × 4 on both sides, the concave groove 32 is 5 mm in width, 2 mm in depth × 2 on both sides, H-shaped The intermediate web thickness is about 2 mm. 30-G, flange portion 31 has W2 mm × 4 on both sides, concave groove 32 has a width of 8 mm, depth of 4 mm × 2 on both sides, and an H-shaped intermediate web thickness of about 2 mm. . 9LW / 10U H-shaped part dimensions are 30-E, flange part 31 is W2mm x 4 on both sides, concave groove part 32 is 6mm in width, depth 2.5mm x 2 on both sides, H-shaped The intermediate web thickness is about 2 mm. 30-G, flange part 31 is W2 mm × 4 on both sides, concave groove part 32 is 9 mm wide, depth is 4.5 mm × 2 on both sides, and the H-shaped intermediate web thickness is about 2 mm. ing.

FIG. 5 illustrates an implementation of the configuration of the grip portion. In order to reduce the weight, a hollow part 47 is provided in the PP octagonal cylindrical body part 40-B, and the thickness of the cylindrical wall part 46 is about 1.5. The cross-sectional dimension of the PP octagonal cylindrical body 40-B is as shown in the cross-sectional view 5-2 in FIG. The side part 45-B has an octagonal shape such that the width is 9 mm × both sides and the diagonal part 43-B has a width of 2.8 mm × four sides.
Since the tip of the grip part 40-B is tapered at a shoulder part (grip shoulder part) 41-B having a length of about 10 mm, the grip part and the shaft part can be smoothly joined at a step. The head portion, the shaft portion, and the grip cylindrical body portion are integrally formed (molded separately from the end portion).

In addition, as a structure, the cylindrical body part and the end part are separately formed, and the end part 44-B is provided with an insertion part 48 part for insertion and joining to the cylindrical body space part 47. The outer diameter of 48 is preferably matched with the inner diameter of the cylindrical body, and is provided with a thickness of 2 mm of the bottom surface portion 50-B, and plays a role of increasing the strength of the end.
Further, in order to firmly attach the grip cover part, a plurality of fine groove groove-like patterns (such as rib-like patterns) may be provided on the surface of the cylindrical body.
The cylindrical body part and end part fitting step of the separately formed grip performed as described above are carried out in FIG. 6, and the insertion part 48 of the end part is inserted and fitted into the hollow part 47 of the cylindrical body. And it is an integrated grip. The length L of the PP cylindrical body portion 40-B is 80 mm.

In FIG. 7, instead of the grip tape, a foamed rubber material cylindrical cover 51 is provided that can be attached to the shape of 40-B, and the foamed rubber has elasticity. When the vertical cross section of the grip part 40 in a state where the foamed rubber grip cover part 51 is attached to the cylindrical body part 40-B, which is difficult to come off due to close contact with the 40-B, is provided in FIG. A long cylindrical space 47, a longitudinal section layer of the cylindrical body portion 40-B and a foam rubber grip cover portion 51 having a thickness of 3 mm (or 2 mm thickness), an end portion 44 having a thickness of 5 mm (44 thickness). It is confirmed that the wall thickness of the bottom surface portion 50 of the cylindrical foamed rubber cover end portion is 2 to 3 mm.
The dimensions of the straight partial cross section of the finished octagonal cylindrical grip body 40 with the foam rubber grip cover attached will be described with reference to the 7-2 cross sectional view of FIG. First of all, when measured on the four straight parts of the handgrip, it is W21 mm2 × T19 mm2 and when measured on the eight sides, the width of the front plane part 42 is 12.48 mm × both sides, and the width of the side plane part 45 is The width of the 10.48 mm × double-sided and diagonal-sided portion 43 is an octagonal grip portion 40 with a foam rubber cover attached such as 5.23 mm × four-sided. (10LW and 9LW grip dimensions are listed in the example table.)

１０ＬＷ／１１Ｕのラケットグリップ全長とＰＰ筒、発泡ゴム筒体断面寸法の一覧表、
一覧表（４−２）３歳用

９ＬＷ／１０Ｕのラケットのグリップ全長とＰＰ筒、発泡ゴム筒体断面寸法の一覧表、
一覧表（４−３）４〜５歳用

上記グリップ各部寸法例表の説明、Ｗ×Ｔは長方形の寸法、面取り後八角形になる。正面幅は２面、側面幅は２面、対角面が４面での八角面横幅です。 7-3 in Fig. 7, we will explain the dimensions of the eight-sided expansion of the foamed rubber end 44. The thickness of the foamed rubber end 44 is 5mm and measured on four sides. It is W29mm2 side x T27mm2 side. , The width of the front plane portion 42 is 17.2 mm × both sides, the width of the side plane portion 45 is 15.2 mm × both sides, and the width of the diagonal portion 43 is 8.4 mm × four sides. A bulging outer dimension is provided in the eight directions of the foam rubber end. The foamed rubber end portion 44 plays a role in preventing natural slipping from the racket hand.
11LW / 12U racket grip total length and PP cylinder, foam rubber cylinder cross-sectional dimension list,
Table (4-1) for 2 years old

10LW / 11U racket grip overall length and PP cylinder, foam rubber cylinder cross-sectional dimension list,
List (4-2) 3 years old

9LW / 10U racket grip overall length and PP cylinder, foam rubber cylinder cross-sectional dimension list,
List (4-3) for 4-5 years old

The description of the dimension table of each part of the grip described above, W × T is a rectangular dimension and becomes an octagon after chamfering. The front width is 2 sides, the side width is 2 sides, and the diagonal side is 4 sides.

As shown in FIG. 8, a cylindrical foamed rubber grip cover portion 51 is entirely attached to the end portion except for the grip tip shoulder portion, and a bottom surface portion 50 having a thickness of 2 to 3 mm is also provided on the bottom surface of the end. Foam rubber has rebound resilience, flexible cushioning, and provides natural prevention of sliding off the racket. In other words, the racket basically does not slide down from the hand.
In addition, the impact force is also cut off due to the shock-absorbing property, and it has an effect of preventing injuries by making it difficult to transmit the impact to the child's hand. Furthermore, by making a good impression on young children, racquet sport play becomes fun, and the number of interested children increases, which is effective for the spread of sports.

The present invention also has a reason for selecting a PP material in order to reduce manufacturing costs in social circumstances. For example, the PP material may be changed to a carbon material according to the demands of children in the world. You may change to the same manufacturing method as a carbon racket. More effective.

≪About five carbon material rackets of the second embodiment≫
The present invention is a soft badminton racket made of carbon material suitable for hitting a soft badminton shuttle, and the present invention is an evolution for juniors based on a badminton racket based on badminton rackets in the gist of increase / decrease countermeasures, lightness, thinness, There are 5 stages for adults, 4 stages of age depending on the stage of development for children aged 12 to 12 years old, and 5 stages of rackets are added according to the age stage. The carbon material racket 100 will be described with reference to FIGS. 9 to 17 of a 5U size racket.

上表ラケットサイズでは、バドミントンラケットのサイズに基づき派生出来たものので、バドミントンラケットのサイズは総重量表示する記号ですが、本発明のソフトバドミントンラケットのサイズが違って、重さだけではなく、長さと幅のサイズにも示される。５ＬＷ／５Ｕに例擧すると、Ｌは全長６７５ｍｍです、Ｗはヘッドの幅２０５〜２１０ｍｍです、５Ｕは、バドミントンラケットの重量サイズ７５〜７９ｇをそのまま使用している。
全長６７５ｍｍの５ＬＷ／６Ｕから８ＬＷ／９Ｕへ３段階同じ段差で一段ずつ段段短縮５０ｍｍ設けている。６歳から１２歳までは４サイズラケットに設けられているですが、もしくは３本を増やして、６、７、８、９、１０、１１、１２歳まで各一本ずつでも良い。 This implementation provides 5 reference sizes for the selection of athlete rackets from male adults to 6 years old according to the developmental stage of young children.

The above table racket sizes are derived from the badminton racket size, so the badminton racket size is a symbol to display the total weight, but the soft badminton racket size of the present invention is different, not only the weight but also the long Also shown in size and width. In the case of 5LW / 5U, L has a total length of 675 mm, W has a head width of 205 to 210 mm , and 5U uses a badminton racket weight size of 75 to 79 g as it is.
From 5LW / 6U with a total length of 675mm to 8LW / 9U, a step reduction of 50mm is provided step by step at the same step in three steps. From 6 years old to 12 years old, it is provided on a 4 size racket, or it is possible to increase 3 to 1 each for 6, 7, 8, 9, 10, 11, 12 years old.

≪About racket 100, each part of composition is roughly explained. ≫
FIG. 9 is a front view showing the configuration of the racket 100. The soft badminton racket 100 has a head portion 120, a shaft portion 130, and a grip portion 140.
The racket 100 has a total length of 675 mm and a width of 205 to 210 mm. By inserting 3 to 7 g of soft lead weight into the hollow inside of the tip, the thickness of the frame part (ball striking face frame) 121 of the annular head part 120 is set to 1.0 mm, (for adult male rackets only) A hammer portion 122 that can exert such hitting power can be formed. In order to improve the hitting surface, the grommet and the string are reduced, the vertical string portion 123 and the horizontal string portion 124 are connected to the frame portion 121, and a reticulated hitting surface that is alternately cross-knitted is formed.
A T-shaped joint portion 125 is provided inside a T-shaped intersection formed to connect the lower end of the head portion 120 and the tip portion 131-F of the shaft portion 130 (shown in detail in FIG. 11). Bonding method). A bending elastic neck portion 132 having a length of 15 to 30 mm deformed into an oval shape is provided at a portion of the joined shaft that contacts the neck of the racket.
The tail part 131 of the shaft part 130 and the grip part 140 for operating the racket are connected, and the tip of the grip 140 is formed in a tapered shape so that the thick grip part and the thin shaft part can find compatibility, and the tapered part has the same shape. The grip body 141 is attached, the grip body is formed into a flat octagonal curved bar shape, and the central portion of the front half is formed with a large bulge shape to provide an agile operation portion 142. A ring finger and a little finger operation part 145 formed thinly on the grip waist part are provided, and a power end part 146 is formed by forming the shape of the end of the grip with a flat octagon and a large bulge. A grip portion 140 having a two-step grip attack / defense function in a raised curve shape is formed. A soft badminton racket for competition made of carbon material can be configured with the above-described components.

In FIG. 10, an example of upper and lower grommets 126 and large grommets 127 are fitted on the side surfaces of the frame portion 121 with a space therebetween. The side surface of the two-step raised curve shape of the grip part 140 connected to the tail end of the shaft 130 can be confirmed. Compared with the front view, it can be seen that the double-sided flat surface portion 149 on the side surface of the grip has a flat octagonal shape that is narrower than the lateral width of the front surface 143.
Further, an end cap portion 147 attached to the bottom surface of the end is provided with a grip tape retaining guard portion 148 having a width of 1 mm at the end end surface, and 147 and 148 are integrally formed using hard plastic. A soft badminton racket made of carbon material that is equipped with the components described above.

図１０−２に於いて、上附一覧表（６）記載している５サイズのヘッド部１２０の各部構成を参照して説明する。
幼い子供達のどの年齢にも軽いラケットが使えられように、年齢段階に於いて、ラケットを６ＬＷ、７ＬＷ、８ＬＷのように３段分けてヘッド大きさを段別に縮小。ジュニア用４サイズラケットのヘッドフレームの重量を軽減ために、肉厚減少の対策を行う、表（６）のように、成人男性用５ＬＷ／５Ｕが１.０ｍｍ、以下へ段段0.1ｍｍずつ薄くに設けられている。
前記５サイズ全てのヘッドフレーム部１２１の内部空間が同一内径寸法設けられた為に、外形が前記肉厚さによって太さが異なる、大サイズから小サイズへ外形が一段０.２ｍｍずつ段別細くに形成されている。（図示せず。）
ヘッドの縮小と肉厚み薄くになる事、または外形細くになる事によるヘッドフレームが可なり軽くになる事で、軽薄短小化でのラケットを構成出来る。
ラケットの軽薄短小化によるスイング時空気の抵抗を低減出来る。幼い子供達のどの年齢にも使用でき、手首や肘の痛み防止にも良い効果を奏する。 In the case of a general badminton racket, 76 grommets to be fitted to the head frame are used, and 22 vertical strings and 23 horizontal strings are used. ≫
As for the size of the head portion 120 of 10-2 in FIG. 10, the five rackets are divided into four-stage sizes, and the external sizes of 12 to 17 years old and 5LW / 6U for adult women and 5LW / 5U for adult men are almost the same. It ’s the same, but it ’s just the weight of the components.

With reference to FIG. 10-2, description will be made with reference to the configuration of each of the five-size head units 120 described in the superscript list (6).
In order to allow lighter rackets to be used by young children of all ages, the head size is reduced in stages by dividing the racket into three stages, such as 6LW, 7LW, and 8LW. In order to reduce the weight of the head frame of the 4-size racket for juniors, measures are taken to reduce the wall thickness. As shown in Table (6), 5LW / 5U for adult males is 1.0 mm, and the thickness is reduced by 0.1 mm to the following level. Is provided.
Since the inner space of all the five sizes of the head frame part 121 is provided with the same inner diameter, the outer shape varies in thickness depending on the thickness, and the outer shape is thinned step by step by 0.2 mm from large size to small size. Is formed. (Not shown)
By reducing the head and thinning the wall thickness, or by making the head frame lighter and thinner, it is possible to construct a racket that is light, thin and small.
The air resistance during swing can be reduced by making the racket lighter and thinner. It can be used at any age by young children and has a good effect on preventing wrist and elbow pain.

<< The method for forming the hammer portion 122 of the adult male racket head 10-3, 10-4, 10-5 in FIG. 10 >>
As shown in Fig. 10-3, a soft lead weighing about 5g is formed into a rectangle with a thickness of about 2mm, a width of about 7mm, and a length of about 45mm. The lead hammer portion 128 is formed by bending it into a semicircular shape as shown in 10-3.
In addition, the annular frame portion 121 of the head portion 120 is formed by placing a resin sheet cylinder wound in a cylindrical shape by placing a foamable resin that is heated and simultaneously foamed inside a thermoplastic resin sheet by a conventional processing method. The lead shape is formed as shown in FIG. 10-3 by reducing the length of the foamable resin part 129 in the longitudinal direction of the annular frame at the center of the tip of the annular frame when the sheet is wound. 128 is disposed, and the fiber reinforced sheet is wrapped around the resin sheet cylindrical portion 121-A by wrapping 128 and 129 as shown in FIG. 10-4.
The resin sheet cylinder 121-A is bent in an annular shape and placed in a mold in a state where both ends are butted, and then heated and pressurized to foam the foamable resin 129 in the frame, thereby forming the resin sheet cylinder. Is spread out along the mold, and the frame is formed into the desired shape shown in FIG. 10-5 along the mold. At the same time, the lead portion 128 in the frame is fixed to the shape along the mold. The lead hammer portion 128 is suitable within the range of 3 to 7 g.
The hammer portion 122 can be configured with the power enhancement of an adult male 5LW / 5U size racket.

In addition, as a part of the measures to improve the performance and power of the racquet for hitting the racket, in the process of enlarging the mesh of the hitting surface, first, the mesh of the 5LW / 5U and 5LW / 6U size rackets is set to 10 mm square. The following size meshes are provided step by step and larger. The list (6) has a mesh size description of each size. (The mesh of each size can be freely adjusted from 1 mm to 2 mm for further expansion. However, if the number of strings is reduced according to the number of strings, it will be necessary to change according to the reduced arrangement of grommets.)
In addition, the number and the number of grommets from 5 LW to 8 LW, which determines the arrangement position and number of the grommets 126 and 127 and the number of the vertical string portions 123 and the horizontal string portions 124 according to the mesh size and the frame size provided, are listed. As described in Table (6). The formation of a reticulated ball hitting surface of the annular frame 121 of 10-2 in FIG. 10 will be described for a 5LW / 5U size.
In the 5LW / 5U example, 60 small size grommets 126 are arranged in 68 grommets fitted to the annular frame, and 8 large grommets 127 are provided to pass two strings. The total number is 68. 18 vertical string portions 123 and 19 horizontal string portions 124 are used, folded back through the grommet holes, and alternately cross-knitted to form a uniform 10 mm square reticulated ball hitting surface.
By reducing the grommet and string, and expanding the mesh greatly by taking measures against the above-mentioned striking surface, it is possible to swing at a light and fast speed even for young people. Moreover, a soft badminton racket set suitable for striking a soft shuttle formed with a sponge sphere having a large, soft and light feature and a belt-like blade can be formed.

カーボン素材製での５サイズのラケットの環状ヘッドを支持するシャフト部１３０の形成方法として、４.６ｍｍ外径の一本金属丸棒状治具芯棒を用い、シートローリング法で形成させるため、各サイズパイプ状シャフトの内径部１３６が全て４.６ｍｍのような寸法に設ける。幼い子供達の発達段階に於ける、ラケットを軽くさせ為に６ＬＷ、７ＬＷ、８ＬＷサイズのシャフト部１３０を表６記載のような段別短くに設けられている。一覧表（７）の記載通り。
また、どの年齢にも軽くに使えられる為、サイズ段別にシャフトの肉厚を減少させ、各サイズ肉厚部１３７の厚寸法が、一覧表（７）記載の通り５ＬＷ／５Ｕから小サイズへ段段０.１ｍｍずつ減少設けられている。
各サイズシャフト内径部１３６の寸法同一為に、肉厚部１３７の厚さによる各サイズシャフトの外径部１３５の寸法が一覧表（７）記載のようなサイズ段別に細くに形成されている。
シャフトの対策による可成り段別に細く、軽くになり、スイング時空気の抵抗を低減出来て、どの様な小さい子にも自由自在で機敏的な操作事ができる。 Until now, the badminton racket shaft has been produced by a conventional manufacturing method, and the shaft in the shape of a hollow round pipe made of multilayered carbon fiber prepreg molding has been pursued to the limit, and there is a problem that it is difficult on the other hand, There is a problem that it is extremely difficult for a single shaft to simultaneously exhibit the compatibility performance.
However, the present invention solves the coexistence problem by providing an elliptical bending elastic neck portion 132, and the single shaft is made rigid so that the performance can be exhibited simultaneously.
This will be described in detail with reference to FIGS. 11, 12, 13, and 14.

As a method for forming the shaft portion 130 for supporting the annular head of a five-size racket made of carbon material, a 4.6 mm outer diameter single metal round bar-shaped jig core bar is used to form each by a sheet rolling method. All the inner diameter parts 136 of the size pipe shaft are provided with a size of 4.6 mm. In order to lighten the racket in the development stage of young children, the shaft portions 130 of 6LW, 7LW, and 8LW sizes are provided in short steps as shown in Table 6. As described in list (7).
In addition, because it can be used lightly at any age, the thickness of the shaft is reduced by size step, and the thickness dimension of each size thickness portion 137 is stepped from 5LW / 5U to a small size as shown in the list (7). The thickness is reduced by 0.1 mm.
In order to make the size of each size shaft inner diameter portion 136 the same, the size of the outer diameter portion 135 of each size shaft according to the thickness of the thick wall portion 137 is formed so as to be narrower by size step as described in the list (7).
The shaft measures make it thinner and lighter and can reduce air resistance when swinging, allowing any small child to operate freely and quickly.

<< The shaft part 130 is divided in shape to provide an elliptical shape of 132, and is formed into three parts including a distal end part 131-F, a bending elastic neck part 132, and a shaft tail end part 131 >>
The front end portion 131-F of the shaft portion 130 according to the present embodiment is provided with a hollow portion 138 for accommodating the lower end of the T-shaped joint, and is adjacent to the lower portion of the joint portion accommodated inside the hollow portion 138 of the 130-F. An elliptical bending elastic neck 132 is formed by a shaft special jig (which will be described later with reference to FIGS. 12, 13, and 14). There is no risk of tearing because the thickness of the shaft does not change. Since the axis direction of the ellipse's major axis 133 is parallel to the ball striking surface, there is no distortion to the left or right during the swing, and the balance does not feel twisted or blurred. By utilizing the principle that the elliptical short axis part 134 has a weak bending rigidity against strain caused by external forces due to the axial direction of the long axis, it is possible to produce high performance with a shaft with high rigidity. Since the axial direction of the short diameter portion 134 is directed to both ball striking face directions, the ball striking face is generated only when it is swung. 5LW / 5U has a length of 15-30mm (the length of each size is listed in Table 7), but the length varies depending on the length of 132 in the tube axis direction. It is adjustable. Since the elliptical bending elastic neck 132 generates a large bending at the moment of impact, vibration and resonance are suppressed and attenuated, and the impact force on the wrist and elbow is also cut off. It is reduced. Higher resilience can be demonstrated.
Reduction of the annular frame steps of the head structure implemented in the steps 0048 to 0050, providing a thin wall thickness, reducing the outer shape, reducing grommets and strings, expanding the striking surface mesh, or 0051 The number of shafts that have been implemented in 0052 steps is reduced, and the outer diameter of the shafts is also made smaller in steps, so that any number of young children can take advantage of lightness, thinness, shortness, smallness, and reduction. Depending on the developmental stage of young children who can start soft badminton, they can make a light and thin racket that can be changed to use.

≪The dimensions of each part of each size shaft are as described in the list (7). ≫
The special shape of the shaft portion 130 will be described from the front view 11-1 of FIG. 11. The shaft tip portion 131-F is a portion provided for connection with the head humme, and the T-shaped vertical portion of the joint portion 125 is the tip of the shaft. For the purpose of insertion and fitting into the hollow portion 138 of the portion 131-F, it is preferable that the axial length of the 131-F matches the vertical length of the joint. It is deformed into an oval shape with a length of 15 to 30 mm downward and is provided with a bending elastic neck portion 132, and the tail end portion 131 of the shaft portion 130 with a length of 230 mm is connected to the grip portion 140.
FIG. 11-2 shows a state where the circular shaft tip 131-F and the elliptical bending elastic neck 132 overlap each other as seen from above.
A diameter of the outer diameter portion 135 of the shaft portion 130 is 7 mm, and a thickness 137 of the shaft portion is 1.2 mm. A hollow portion 138 is provided at the tip 131-F of the shaft to accommodate the joint lower end.
In 11-3 of the side view of the shaft, the portion of the shaft end portion 131-F that appears to be narrower adjacent to the bottom is the elliptical minor axis direction of the bending elastic neck 132.
FIG. 11-4 is a state where the shape 132 is seen from the cross section of the bending elastic neck 132. The thick portion 137 of the bending elastic neck portion 132 is 1.2 mm which is the same as the circular shaft portion. The major axis of the ellipse is 133, and the minor axis 134 has a minor axis of 5 mm (adjustable length). The shaft cylindrical portion inner diameter portion 136 is 4.6 mm. Since the inner diameter of each size shaft is 4.6 mm, the outer diameter due to the wall thickness is reduced, and a single jig core rod of the shaft described later can accommodate all sizes.

Referring to FIGS. 12-1 to 12-4, the configuration of the shaft special jig round core rod according to the present invention will be described. ≫
The shaft of a conventional badminton racket is formed by a sheet rolling method using a metal round bar-shaped jig core bar having a uniform outer diameter up to the length.
The present invention has evolved the shaft jig core rod portion 200 to form a shaft portion 130, and a 85 mm length portion is formed by lathe processing at the tip of a metal round core rod portion 211 having a length of about 230 to 300 mm and a diameter of 4.6 mm. A round bar-shaped tip 213 having an outer diameter of 2.6 mm is formed, and an elliptical male ridge part 212 is formed by cutting a 7 mm length in the next adjacent portion, and the minor axis 212 has a minor axis of 2.6 mm. Since it can be removed from the seat tube, it has a similar dimension of 4.6 mm to the major axis 212 and the diameter of the round core rod 211 as seen in the front view 12-1 in FIG. It can be confirmed from the figure. When viewed from the side view 12-2, it can be seen that the narrow axis direction of the male rod portion 212 can be confirmed, and that the round core rod portion 211 adjacent to the lower side is thin.
When it is desired to change the minor axis size of the bending elastic neck portion 132 oval, the size of the bending elastic neck portion 132 oval shape can be changed by enlarging or reducing the minor axis of the male ridge portion 212. However, it is necessary to change the shape of the upper and lower caps of the oval forming pressurizer shown in FIG.
In addition, the formation of the extended round core bar portion 211-B of the round core bar will be described. As shown in Fig. 12-3 side view and Fig. 12-4 front view, a pipe with an outer diameter of about 4.6 mm, a length of about 200 mm and an inner diameter of just over 2.6 mm is used. Cut off the elliptical concave shape of the tip of the tip 55 mm, the female ridge portion 214 is formed, the shape of the female ridge portion 214 exactly matches the shape of the elliptical male ridge portion 212, a little for insertion and removal Loosening is preferred. The extended round core portion 211-B can be formed, and the shaft has a special jig core portion 200 configuration.

<< Additionally, a method and a procedure for forming the bending elastic neck 132 of the shaft using the special jig core rod portion 200 of the shaft will be described with reference to FIGS. ≫
The extended round core rod portion 211-B formed in FIG. 12 is a component that maintains the shape of the shaft tip portion 131-F cylindrical hollow portion and determines the length in the tube axial direction of the bending elastic neck portion 132. Axial lengths are classified into four types (15-7, 20-40, 25-50, 30-60mm) (listed in Table 7). A part 211-B is provided. (註: For example, when shortening the minor axis of the bending elastic neck for 6-year-old children, the upper base portion 242 and the lower base portion of the male spring portion 212 and the female spring portion 214 and the oval-shaped pressurizer vise portion 240 of FIG. (It is necessary to change the size of 241 as a set.)
As indicated by 13-1 in FIG. 13, since 211 -B corresponds to the 15 mm length of the neck 132, the space length of the hollow portion 215 of 211 -B is the tip round bar-shaped portion 213 of the core rod main body 211. The same length as 85 mm. As a sizing method, a round bar-shaped stopper 216 having an outer diameter of 2.65 mm, which is the same as the inner diameter of the hollow portion 215, is inserted from the rear portion of the hollow portion 215, and the space of 215 is inserted to the remaining 85 mm and fixed with a small set screw. (Not shown), that is, the space length of the hollow portion 215 is 85 mm.
As a connecting method between 211 and 211 -B, the round bar-shaped portion 213 at the tip 211 is inserted into the hollow portion 215 through the hollow portion 215 of the female spring portion 214, and the space of the hollow portion 215 becomes zero. A length of 15 mm is provided between the tip of the female shank 214 having a length of 5.5 mm and the end of 212, and an oval neck 132 having a length of 15 mm can be formed using the oval-shaped exposed portion having a length of 212 mm. . It is the completion | finish state of the jig | tool core rod part 200 of the shaft shown to 13-2 of a figure. The following three sizes are analogized.
Since the extended core rod portion 211 -B 2 corresponds to the 20 mm length of the neck portion 132, the space length of the space portion 215 is 80 mm. Since 211-B3 corresponds to the 25 mm length of the neck portion 132, the space length of the space portion 215 is 75 mm. Since 211-B4 corresponds to the 30 mm length of the neck portion 132, the space length of the space portion 215 is 70 mm.
For example, when the length of the neck 132 is changed from 30 mm to 50 mm, the stopper portion 216 inserted into the hollow portion of 211-B4 is inserted 20 mm deeper, the set screw is tightened, and the space of the hollow portion 215 is fixed. The length is 50 mm. If the male spring portion is inserted into the hollow of the female spring portion up to the stopper portion 216, a bending elastic neck portion 132 having a length of 50 mm can be formed.

A multi-layered cylindrical shaft 130 is formed by winding a carbon fiber sheet around the outer periphery of the core rod part 200 connected in FIG. 13-2 as shown in FIG. 13-3.
As shown in FIG. 13-4, a position corresponding to the oval-shaped male ridge portion 212 in the semi-cured sheet cylinder wound by the above-described sheet rolling method, and the upper and lower concave portions of the cylindrical shaft 130 are described later. 14 is an elliptical bending elastic neck 132 formed by 14 oval forming pressurizers. The shaft part 130 is divided into three parts: a tip part 131-F for connection with the head, a bending elastic neck part 132, and a shaft tail end part 131 connected to the grip part. 13-4 of a figure shows the state which removed the nozzle | cap | die part after drying-hardening in the high temperature drying chamber described later.

<< Description of the oval forming pressurizer is omitted. 14A to 14C, the configuration and role of the vice unit 240 will be described. ≫
Next to 13-3 in FIG. 13, the formation process of the bending elastic neck 132 will be described with reference to FIG. 14 has a semi-elliptical upper base part 241 and a semi-elliptical lower base part 242, and an elliptical bending elastic neck is formed by using the upper and lower base parts and the male lug part.
Since the shape size of the upper and lower caps differs depending on the outer diameter of each size shaft, it may be made according to each outer diameter of the shaft. 14-1 in the figure shows that the upper and lower caps are in an open state, so if they are engaged with each other, it becomes an elliptical shape, and it is confirmed that the middle of 241 and 242 is in the circular shape of the shaft 130 cross section. I can do it.
A hook-and-lock hook fastening portion 243 is attached to the outer side of the upper and lower joint portions on the left and right sides of the upper base portion 241, and a hook portion 244 of the pachin-lock is attached to the outer side of the left and right upper and lower joint portions on the lower base portion 242 The hook portion 244 is provided with a spring portion 244-1, and the spring portion is a part for opening and returning the hook tip, and is preferably a high temperature resistant material. The hook hooking portion 244-2 provided inside the front end of the 244-1 can be snap-locked with the hook fastening portion 243. The portion of 244-2 that protrudes straight forward is provided with an unlocking device 244-3, which can open a snap lock. The snap lock part may make another lock method.
As shown in FIG. 14-2, when the vise portion 240 is closed, when the upper base 241 and the lower base 242 are engaged with each other, pressure is applied to the central shaft portion 130 to form an elliptical shape. The bend elastic neck portion 132 is formed by deforming into an elliptical shape by the upper and lower caps and the male lug portion 212 where the snap lock portion 245 is locked with the snap.
When the vise part 240 is opened, the upper and lower cap parts are removed from the vice part (a device for easy removal is provided). The shaft part 130 is locked in the upper and lower cap parts and is dried in a high-temperature drying chamber as it is, and the shaft part 241 and 242 is removed as shown in FIG. When viewed from the side, the cross section of 212 can be confirmed in the oval 132, and when viewed from the side, the state shown in FIG. A core rod is extracted from both ends of the cylindrical shaft portion 130 to form an elliptical shape 132 in a cross-sectional state indicated by 14-5 in the figure. The short diameter of the short diameter part 134 is 5 mm. (Pressurization method by another equipment may be adopted.)

≪The precedent of the raised shape of the grip part started with the manufacture of the sword grip of ancient human weapons, and now the world has been widely applied to tool grips and various hand operated levers. ≫
Until now, the racket operation is almost flat with a straight octagonal bar shape, so the hitting force cannot be fully demonstrated.
In addition, it is necessary to create an oblique face surface by the wrist and elbow pronation or supination motion when changing flight is attempted, and the ball hitting force cannot be sufficiently exerted, which may cause elbow pain.
By the way, the offense and defense grip according to the present invention has a two-point raised curved shape and has a two-point grip and various operation functions.
Hereinafter, the configuration of the grip portion 140 will be described with reference to a front view 15-1 and a side view 15-2 in FIG.
A tapered shape is formed at the tip of the grip portion 140 for connection to the narrow shaft tail end portion 131, and a grip cap portion 141 having the same shape is covered on the tapered shape portion. A method of attaching foamed rubber portions 144-Y (showing the diagonal surface portion of cross-sectional view 16-2) to the four surfaces of the diagonal width portion 144 of the deformed octagonal bar on the first half of the non-tapered portion of the grip The width of the two-sided flat part 143 and both side parts 149 parallel to the ball striking surface by narrowing is widened, and the width of the surrounding eight sides by the process of cutting the waist part of the grip is narrow and can be formed thin, so When the little finger operation part 145 is provided and the 145 part is formed thinly, the first half part of the grip is prominently formed, and the optimal agility operation part 142 for gripping the raised shape is provided. During the game, 145 parts of the ring finger and little finger are held and stabilized, and 142 is twisted and turned with the fingertips of the thumb and the middle finger, and the diagonal part 144 is effective by fine and clever operations that change the flight by switching the racket side to the left and right. Because it is narrow, the corner part protrudes clearly, and the direction of the striking surface can be accurately manipulated with the sense of a finger, so that the striking surface required for instantaneous changes can be simplified without slipping when twisting the fingertip.
In addition, the end part of the grip is formed into a large octagonal shape with a flat octagon, and this raised shape is closely aligned with the shape of the palm, and the power end part 146 is provided for optimal gripping, so that the curve at the two-step raised The grip portion 140 is configured to have an offense and defense function in which the shape grip portion is gripped in two steps.

Further, when the racket is operated using 142, the 145 portion is thin and slightly elliptical, so that the racket can be easily rotated, and an arbitrarily changing hitting surface can be created at the moment of impact.
In addition, since the power end portion 146 is provided in a flat octagonal and greatly raised shape, it can be hit by a single player as well as a double player at the moment of impact. The striking ball gripped by the end portion can greatly increase the striking force by extending the intermediate distance between the end portion where the hand force is applied and the ball hitting surface at the point of action.
In addition, the peripheral edge of the end cap portion 147 made of hard plastic attached to the bottom of the end is provided with a grip tape stop guard portion 148 having a protruding width of 1 mm by the bottom of the end. I can do it.

≪上表の１４０、１４１、１４２、１４３、１４９、１４４は、グリップ各部の番号です。表の寸法単位は、ｍｍ。≫
図１６の１６−３に於いて、エンド部１４６の断面寸法を説明する。四面測るは、（Ｗ２７ｍｍ×２面）×（Ｔ２４ｍｍ×２面）となっている長方形を面取り加工による扁形の八角面形状になる。八角面測る寸法を説明すると、打球面と平行の平面横幅１８ｍｍ×両面、側面横幅１６ｍｍ×両面、対角面横幅６ｍｍ×四面との八角面になっている。
本発明に係る機敏的操作機能と打撃パワー機能を具備する攻守兼備グリップ部が構成できる。他サイズの断面寸法が下表記載している。

≪上表の寸法単位は、ｍｍ。≫ Further, when viewing the plan perspective view 16 in a state in which the grip portion is completed, the shaft tail end portion 131 is fixed to the inside via a grip tip tapered shape, and a hollow portion 150 is provided for lightening.
In addition, since the two-step bulge of the agile operation part 142 and the power end part 146 and the thin part of 145 are provided, a curved shape that is very easy to grip and operate is formed. 16-2 of FIG. 16, the dimensions of the cross section of the grip first half 142 are (W23 mm × 2 surfaces) × (T20 mm × 2 surfaces), which is a flat octagonal shape by chamfering. . Explaining the octagonal dimensions, the flat portion 143 parallel to the ball striking surface is W20 mm × 2 surfaces, the side surface portion 149 is T16.4 mm × 2 surfaces, and the foam rubber portion 144-Y is attached to the four-sided diagonal surface 144. , Having a width of 2.3 mm × 4 surfaces, the agile operation unit 142 can be configured.
Other sizes of cross-sectional dimensions are listed in the table below.

≪140, 141, 142, 143, 149, 144 in the table above are numbers of each part of the grip. The unit of dimension in the table is mm. ≫
A cross-sectional dimension of the end portion 146 will be described with reference to 16-3 of FIG. The four-sided measurement is a rectangular octagonal shape obtained by chamfering a rectangle of (W27 mm × 2 surfaces) × (T24 mm × 2 surfaces). Explaining the dimensions to measure the octagonal plane, it is an octagonal plane that is parallel to the striking surface and has a plane width of 18 mm × both sides, a side width of 16 mm × both sides, and a diagonal width of 6 mm × four sides.
An offense and defense grip portion having an agile operation function and an impact power function according to the present invention can be configured. The cross-sectional dimensions of other sizes are listed in the table below.

≪Dimensional unit in above table is mm. ≫

In addition, regarding the grip function, the tip of 142 is narrowed at the part connected to the cap 141, and the ring finger and the little finger operation part 145 at the waist of the grip are also thinned. It becomes easy to operate the racket that fits perfectly with the shape of the palm grip, grip grip methods are roughly divided into three, Eastern grip, Western grip, thumb up, each grip way Because there are advantages and disadvantages, the three types of grips can be transformed in an extremely simple and flexible way by flying during intense competition.
Furthermore, 60% of the defensive range uses the thumb operation unit 143, and the thumb's power point stabilizes by holding 145 parts of the ring finger and little finger, such as a cross shot of the back and course change, and the thumb uses a wide width of 143 parts. The index finger and the middle finger twist 144 parts to turn the racket. The biggest feature is that the rotation axis is small and the racket turns around quickly, and the application flight is received by thumb-up when performing smash (push) receive Is easy to receive. Furthermore, it can be easily done to those that require the speed of the racket surface change.
In particular, when catching a drop or shuttle that sinks both sides of the front of the opponent's court from the middle or the back of the court, you can quickly change the face angle and cut the shuttle to fly diagonally.
Furthermore, from the left rear of your own coat, aiming at the opponent's left site, you can cut smash by quickly changing the face angle of the face at the moment you hit the ball without the wrist and elbow pronation. The biggest feature is that it is hard to read the course until it is difficult to understand where it hits immediately before hitting by changing the hitting surface at the moment of impact.
In addition, the foamed rubber portion 144-Y affixed to the four diagonal surfaces of the agile operation portion 124 is less likely to cause frictional pain in the palm even in a long game due to rebound resilience and a flexible cushion.

Further, the role of the grip end portion of the badminton racket so far is to prevent the racket from sliding off from the hand, and it is extremely difficult to hit the ball by the shape.
The end portion 146 of the racket grip of the present invention is a flat octagon that can hold a large raised shape and a palm shape exactly, and the good hitting method of gripping this end portion is the intermediate distance between the end portion to which hand force is applied and the working point hitting spherical surface. It is extended by about 50 to 60 mm, the hitting point of the shuttle becomes high, the flight between the hitting point and the falling point is shortened, the time difference can be shortened, and the hitting ball power can be exerted greatly.
It also increases the decision rate of the most aggressive smash that grabs 146 and strikes the opponent's court at an acute angle from the overhead stroke.

Referring to FIG. 15, the effect of the elliptical bending elastic neck of the racket will be described. ≫
A racket can be constructed by connecting the head to the tip of the shaft and connecting the tail and grip. With the shaft provided with the bending elastic neck portion 132, the bending repulsion point of the shaft portion is narrowed to one point, the rigidity of the middle and rear portions is increased, and the operation of the racket becomes easier. Since the round pipe-shaped shaft applies the external force, the bending rigidity of the eight sides is the same, so it is not possible to bend only in the determined direction. Because the elliptical bending elastic neck is different and has both a major axis and a minor axis, the major axis in the direction parallel to the ball striking surface is not distorted for rigidity enhancement, and the minor axis direction toward the ball striking surface is Because the rigidity becomes weak, the bending width can be greatly amplified. The bending elastic neck 132 to which external force is applied by the racket in FIG. 15 is shown to be large, and the problem that the single shaft has the simultaneous rigidity at the same time and the performance cannot be demonstrated is solved. Due to the simultaneous performance of the performance, the operation performance is effectively superior and the hitting power can be greatly increased.

<Modification>
While the embodiments of the present invention have been described above, the present invention can be variously modified in addition to this. This will be described below.
In the above-mentioned first embodiment, the PP material racket is 11LW / 12U for 2 years old, 10LW / 11U for 3 years old, 9LW / 10U size racket for 4-5 years old is made of PP material to reduce manufacturing cost However, even young children may be made of carbon material to satisfy the desire for a high-class feeling of carbon racket that has envy.

In Example 2, it corresponds to four rackets of 8LW / 9U · 7LW / 8U · 6LW / 7U · 5LW / 6U from 6 to 12 years old. However, for the growth of young children, it is possible to handle one racket at a time from 6 years old to 1 year old, that is, 7 rackets from 6 to 12 years old.
In addition, the carbon-made competition racket is not limited to soft badminton use, but may be used for badminton competition or badminton squash competition.

About 10PP material racket, 20 head part, 21 flange part, 22 concave groove part, 23 vertical string part, 24 horizontal string part, 25 joint part, 26 web part, 30 shaft part, 30-E shaft tip part, 30- G shaft tail end part, 31 shaft flange part, 32 shaft concave groove part, 33 web part, 40 grip part, 40-B cylindrical body part, 41-B shoulder part, 42 grip front part, 42-B cylinder The front surface of the main body, the diagonal surface of the 43 grip, the diagonal surface of the 43-B cylindrical main body, the 44 end, the end of the 44-B cylindrical main body, the side surface of the 45 grip, and the 45-B cylindrical main body. Side face part, 46 cylinder wall part, 47 grip space part, 48 insertion part, 49 slip-on part, 50-B end bottom part, 50 foam rubber cover bottom, 51 foam rubber cover part.
About 100 carbon material racket, 120 head part, 121 frame part, 122 hammer part, 123 vertical string, 124 horizontal string, 125 joint part, 126 small size grommet part, 127 large size grommet part, 128 lead hammer part, 129 foam Resin part, 121-A resin sheet cylindrical part.
130 shaft part, 131-F shaft tip part, 131 shaft tail end part, 132 bending elastic neck part, 133 elliptical neck major axis, 134 elliptical neck minor axis, 135 circular shaft part outer diameter, 136 The inner diameter of the cylindrical shaft portion, the thickness of the 137 shaft, the hollow portion at the tip of the 138 shaft,
140 grip part, 141 grip cap part, 142 agility operation part, 143 plane part and thumb operation part, 144 diagonal face part, 144-Y foam rubber part, 145 ring finger and little finger operation part, 146 power end part, 147 end cap part 148 grip tape guard part, 149 grip side part, 150 grip hollow part.
200 shaft jig core, 211 round core, 211-B extension core, 212 male rod, 213 round rod shaped tip, 214 female rod, 215 hollow core, 216 stopper . 240 vise part, 241 upper base part, 242 lower base part, 243 hook fastening part, 244 hook fastening part, 244-1 spring part, 244-2 hooking part, 244-3 unlocking device part, 245 snap lock part.

Claims (5)

Soft badminton racket set for soft badminton,
In the development stage of young children, the racket used can be molded from reinforced plastic or polypropylene (PP) material, so that you can start playing racket activities because you are interested in playing while you are 2-5 years old. The competition racket used from 6 years old to adult athletes is made using carbon material,
As the size of the racket changes with the growth of young children, eight rackets are provided, and the approximate size corresponding to the age is
11LW / 12U total length 325mm for 2 years old , width 135mm, weight 40-44g · 10LW / 11U total length 400mm for 3 years old , width 145mm, weight 45-49g · 9LW / 10U total length 475mm for 4-5 years old , width 160mm, weight 50 -54g · 6-7 years old 8LW / 9U total length 525mm, width 175mm, weight 55-59g · 8-9 years old 7LW / 8U total length 575mm , width 185mm, weight 60-64g · 10-11 years old 6LW / 7U total length 625mm, width 195mm, weight 65-69g · 12-17 years old is the same as adult women 5LW / 6U total length 675mm , width 210mm, weight 70-74g · adult men 5LW / 5U total length 675mm , width 210mm, weight 75 ~ 79g size and 8 size,
Soft badminton racket set characterized by that. A soft badminton racket made of PP material according to claim 1,
When an elliptical head frame portion having a string made of PP material is molded into a cross-sectional H shape,
A shaft portion with a thin tip and a thick tail end joined to the head frame portion is formed into a cross-sectional H shape,
A hollow shape is provided to lighten the octagonal cylindrical grip part joined to the shaft part.
Further, the provided when provided with a foam rubber grip cover portion having a gentle shock performance, and
A soft badminton racket made of PP. A soft badminton racket for competition made of carbon material according to claim 1,
The racket has 8LW / 9U, 7LW, 8LW / 9U, 7LW / 8U, 6LW / 7U, 5LW / 6U, 5LW / 5U, and 5L racket. / 8U · 6LW / 7U 3 size racket is shortened step by step, and there is a measure to reduce by step provided in the head frame,
The internal space of all five sizes of the head frame is provided with the same inner diameter,
In order to reduce the weight of the head frame of the 5 size racket, the thickness is provided from 5LW / 6U one step at a time.
The outer diameter of the five-size racket formed from a large size to a small size depending on the inner diameter and thickness of the rack, and a frame that is formed step by step;
In the 5 size racket head, the 5LW / 5U and 5LW / 6U size rackets are provided with a tendency to reduce the grommets compared to the badminton rackets used in the conventional 76 grommets, and the head frame size of 6LW / 7LW / 8LW size By the stage, the grommet is provided step by step reduced by one stage,
Due to the decrease in the grommet, the number of vertical and horizontal strings is reduced by size step according to the number of grommets.
The square mesh formed by crossing the vertical and horizontal strings due to the reduction of the string is formed into a knitted mesh-like striking surface that gradually expands from a large size to a small size, and
Forming a hammer part of an adult male racket by placing a weight of 3 to 7 g of soft lead in the hollow interior of the head frame tip of the 5LW / 5U size racket,
A soft badminton racket for competitions made of carbon. A soft badminton racket for competition made of carbon material according to claim 1 or claim 3,
The five-size racket has an inner diameter of the shaft that supports the annular head, all having the same dimension, and
In order to reduce the weight of the racket to a small size, the thickness of the shaft is reduced from the thickness of 5LW / 5U to one step at a time.
The outer diameter of the shaft is formed to be thinned stepwise by the inner diameter of the shaft and the thickness of the stepped size,
The 6LW, 7LW, and 8LW size shafts are shorter than the length of the shaft.
The tip of the 5 size racket in the axial direction of the shaft (the neck portion of the racket) is deformed into an elliptical shape by a special jig round core rod and an elliptical pressurizer formed with an elliptical portion, A bending elastic neck provided with a minor axis on the double-sided striking surface in a direction, and
A soft badminton racket for competitions made of carbon. A soft badminton racket for competition made of carbon material according to claim 1 , claim 3 or claim 4,
By narrowing the four lateral widths of the diagonal face of the deformed octagonal bar in the front half of the grip part that operates the racket, the two lateral flat widths on the ball striking face side and the side face are increased. Because the width of the octahedron is narrowed by cutting to about two thirds,
A large raised shape is formed in the middle of the first half due to the narrow middle part, and
The end portion of the grip has a curved shape like a two-step bulge to form a larger bulge shape in the first half,
A soft badminton racket for competitions made of carbon.

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